PostgreSQL中複合類型列的子列的外鍵約束

Question

有什麼方法可以將複合類型列的子列設置爲外鍵嗎？

我曾嘗試是：

Create Type info_typ_ AS (
    category integer , 
    title text , 
    actor text , 
    price double precision); 

Create Table Products_typobj (
prod_id integer, 
info info_typ_, 
primary key(prod_id), 
Category references Categories(Category) 
); 

，但它不工作。

Answer 1

這對我

Create Type info_typ_ AS (
    category integer , 
    title text , 
    actor text , 
    price double precision); 

Create Table Products_typobj (
prod_id integer, 
info info_typ_, 
primary key(prod_id) 
); 

工作我去掉符合references，因此使用type作品。 SQL Fiddle DEMO

如果你需要外鍵，試試下面的代碼：

Create Type info_typ_ AS (
    category integer , 
    title text , 
    actor text , 
    price double precision); 

Create Table Categories (
    Category int, 
    primary key(Category) 
); 

Create Table Products_typobj (
prod_id integer, 
info info_typ_, 
Category int references Categories(Category), 
primary key(prod_id), 
FOREIGN KEY (Category) REFERENCES Categories (Category) 
); 

SQL Fiddle DEMO